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All Journal Civil Engineering Journal JUTEKS - Jurnal Teknik Sipil INSIST (International Series on Interdisciplinary Research) Journal of Green Science and Technology Journal of Civil Engineering and Planning (JCEP) Journal of the Civil Engineering Forum Jurnal Inovtek Seri Teknik Sipil dan Aplikasi (TekLA) TANJAK : Jurnal Pengabdian Kepada Masyarakat Journal of Green Science and Technology
Jauhari, Zev Al
Jurusan Teknik Sipil, Politeknik Negeri Bengkalis
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Transportation Other

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Anchorage Performance of Headed Reinforcement Bar Embedded in Roof Exterior Beam-Column Joints Zev Al Jauhari; Tomoya Matsui
Civil Engineering Journal Vol. 12 No. 5 (2026): May
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2026-012-05-02

Abstract

The anchorage behavior of headed reinforcement bars embedded in roof exterior beam–column joints is influenced by the presence and configuration of supplementary reinforcement bars. This study aims to develop an improved predictive formulation for anchorage capacity by introducing a modification factor that accounts for the effect of supplementary bars through a combined numerical and analytical approach. A three-dimensional nonlinear FE model was developed and validated against previously reported pullout test results for load–displacement response, crack propagation, reinforcement strain behavior, and stress distribution. The numerical results showed agreement with experimental observations and accurately captured the failure modes. To further interpret the internal force mechanism, a three-dimensional strut-and-tie model (STM) was formulated based on principal stress trajectories obtained from FE analysis. The proposed STM successfully predicted the anchorage capacity, consistent with the experimental results. Parametric studies revealed that increasing the supplementary bar ratio significantly enhances pullout capacity by enlarging the compression strut area and improving confinement within the joint region. Based on regression analysis of the STM results, a new coefficient was introduced to refine the modified Kubota and Murakami empirical formula, incorporating the effect of supplementary bar ratio. The revised formulation provides improved prediction accuracy with low statistical dispersion.
Seismic Risk and Vulnerability Assessment of Mid-Rise Steel Building with Soft Story Effects Ridho Aidil Fitrah; Maulana Arif; Zev Al Jauhari
Journal of Civil Engineering and Planning (JCEP) Vol. 7 No. 1 (2026): JCEP
Publisher : Program Studi Sarjana Teknik Sipil Universitas Internasional Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37253/jcep.v7i1.12311

Abstract

Soft-story irregularity is a critical form of vertical structural irregularity that significantly increases the seismic vulnerability of mid-rise steel buildings. This condition commonly occurs when the ground floor has substantially lower lateral stiffness than the upper stories due to the absence or reduction of masonry infill walls. During earthquakes, seismic demands concentrate at the weaker story, resulting in excessive inter-story drift and rapid stiffness degradation. This study evaluates the seismic performance and fragility of a seven-story steel moment-resisting frame with a soft-story configuration at the first floor. A three-dimensional numerical model was developed in ETABS and analyzed using nonlinear static pushover analysis in both principal directions. Structural properties were designed according to SNI 1729:2020, while seismic loading was based on the response spectrum specified in SNI 1726:2019 for Padang City. The resulting capacity curves were converted into the Acceleration–Displacement Response Spectrum (ADRS) format to define four performance limit states: Slight, Moderate, Extensive, and Complete Damage. Fragility curves were subsequently developed using lognormal cumulative distribution functions and HAZUS methodology to estimate the probability of exceeding each damage state under increasing spectral displacement demands. The results indicate that seismic deformation is concentrated at the soft-story level, causing significant stiffness degradation and reduced post-yield capacity. The fragility analysis reveals an increasing probability of severe damage with increasing seismic demand, confirming that soft-story irregularity substantially increases the collapse potential of mid-rise steel buildings in high-seismic regions.
Co-Authors Alamsyah Alamsyah Andi, Septian Rizki Apriwelni, Siska Arif, Maulana Bernando, Nofri Faisal Ananda Fauzan Fauzan . Febrin Anas Ismail Fia Apriani Garcya, Muhammad Gala Geby Aryo Agista Hery Waluyo Imelia Faradiza Lisya, Mutia Masharya Eko Putra Ridho Aidil Fitrah Ruddy Kurniawan S.Pd. M Kes I Ketut Sudiana . Tomoya Matsui Waluyo, Hery Yokota, Atsushi Zulkarnain Zulkarnain